.addList{
    width:600px;
    height:600px;
    margin-left:200px;
    display: flex;
    text-align: center;
}
.addList li{
    margin-top: 40px;
}
#content{
    float:right;
    margin-left:100px;
    text-align: left;
}
#content textarea{
    width:600px;
    height:400px;
}
#content input{
    float:right;
    width:60px;
    height:40px;
    background-color:darkcyan;
    color:white;
    border: 1px solid white;
}
/* 列表项样式去掉了 */
ul li {
    list-style: none;
}